Sol-gel transition effect based on konjac glucomannan thermosensitive hydrogel for photo-assisted uranium extraction  

基于魔芋葡甘聚糖热敏水凝胶的溶胶-凝胶转变效应光辅助铀富集

作　　者：Xudong Wu Tong Liu Huimin Li Yizhou He Guolin Yang Wenkun Zhu Tao Chen 吴旭东;刘统;李慧敏;贺一洲;杨国淋;竹文坤;陈涛

机构地区：[1]State Key Laboratory of Environment-friendly Energy Materials,School of Life Science and Engineering,School of National Defense of Science and Technology,National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety,Sichuan Civil-military Integration Institute,Southwest University of Science and Technology,Mianyang 621010,China [2]College of Science,National University of Defense Technology,Changsha 410073,China

出　　处：《Science Bulletin》2024年第19期3042-3054,共13页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(21976147,U2267224,and 22106126);the Sichuan Science and Technology Program(2021YFG0096,2024NSFSC1148,2022YFG0371,and 2024NSFTD0012);the Project of State Key Laboratory of Environmentfriendly Energy Materials in Southwest University of Science and Technology(21fksy22);the Research Fund of Southwest University of Science and Technology for PhD(23zx7103);the Open Fund of China National Nuclear Corporation Key Laboratory for Uranium Extraction from Seawater(KLUES202201).

摘　　要：Exploiting the intelligent photocatalysts capable of phase separation provides a promising solution to the removal of uranium,which is expected to solve the difficulty in separation and the poor selectivity of traditional photocatalysts in carbonate-containing uranium wastewater.In this paper,theγ-FeOOH/konjac glucomannan grafted with phenolic hydroxyl groups/poly-N-isopropylacrylamide(γ-FeOOH/KGM(Ga)/PNIPAM)thermosensitive hydrogel is proposed as the photocatalysts for extracting uranium from carbonate-containing uranium wastewater.The dynamic phase transformation is demonstrated to confirm the arbitrary transition ofγ-FeOOH/KGM(Ga)/PNIPAM thermosensitive hydrogel from a dispersed state with a high specific surface area at low temperatures to a stable aggregated state at high temperatures.Notably,theγ-FeOOH/KGM(Ga)/PNIPAM thermosensitive hydrogel achieves a remarkably high rate of 92.3%in the removal of uranium from the wastewater containing carbonates and maintains the efficiency of uranium removal from uranium mine wastewater at over 90%.Relying on electron spin resonance and free radical capture experiment,we reveal the adsorption-reduction-nucleation-crystalliza tion mechanism of uranium onγ-FeOOH/KGM(Ga)/PNIPAM thermosensitive hydrogel.Overall,this strategy provides a promising solution to treating uranium-contaminated wastewater,showing a massive potential in water purification.

关 键 词：Carbonate-containing uranium wastewater Konjacglucomannan Γ-FEOOH PNIPAM Temperature responsivehydrogel Photo-assisted uraniumextraction 

分 类 号：X591[环境科学与工程—环境工程] TL941[核科学技术—辐射防护及环境保护]